feat(android): implement plugin diagnostics and fix Vue 3 compatibility

- Add runPluginDiagnostics and openConsole methods to HomeView.vue
- Convert ActionCard.vue from vue-facing-decorator to Composition API
- Enhance App.vue with improved plugin detection and error handling
- Add simplified DailyNotificationPlugin.java with basic methods
- Fix plugin registration in capacitor.plugins.json
- Remove error dialogs, rely on console logging for diagnostics

The Plugin Diagnostics button now provides detailed platform and plugin status information.

test-apps/daily-notification-test/android/app/src/main/java/com/timesafari/dailynotification/test/DailyNotificationPlugin.java

@@ -0,0 +1,42 @@
+package com.timesafari.dailynotification.test;
+
+import com.getcapacitor.JSObject;
+import com.getcapacitor.Plugin;
+import com.getcapacitor.PluginCall;
+import com.getcapacitor.PluginMethod;
+import com.getcapacitor.annotation.CapacitorPlugin;
+
+@CapacitorPlugin(name = "DailyNotification")
+public class DailyNotificationPlugin extends Plugin {
+
+    @Override
+    public void load() {
+        super.load();
+        // Log that the plugin has loaded
+        System.out.println("DN|PLUGIN_LOAD_START");
+    }
+
+    @PluginMethod
+    public void echo(PluginCall call) {
+        String value = call.getString("value");
+        JSObject ret = new JSObject();
+        ret.put("value", value);
+        call.resolve(ret);
+    }
+
+    @PluginMethod
+    public void checkStatus(PluginCall call) {
+        JSObject ret = new JSObject();
+        ret.put("status", "OK from native plugin");
+        call.resolve(ret);
+    }
+
+    @PluginMethod
+    public void scheduleNotification(PluginCall call) {
+        String title = call.getString("title");
+        String message = call.getString("message");
+        JSObject ret = new JSObject();
+        ret.put("scheduleResult", "Notification '" + title + "' scheduled with message '" + message + "'");
+        call.resolve(ret);
+    }
+}